Quantum random number generators play a crucial role in securing high-demand information contexts by producing true random numbers. Nevertheless, the large volume and high-cost limit their widespread use. Here, we propose a system on chip that fully leverages the advantages of different photonic integrated platforms, where the interference optical paths and photodiodes are integrated on a standard silicon process, while the laser source on-chip is realized on a III-V platform. Using micro-lens coupling package technology, which contributes to a topnotch coupling loss lower than 2dB, the components on different platforms are combined and packaged with the amplifier circuits in a 42mm* 24mm footprint in a butterfly form. This complete miniaturized and cost-effective entropy source enables outputting a vacuum noise signal with a 3dB bandwidth of over 500MHz. After sampling and post-processing, a random number generation rate of up to 6.57Gbps is achieved. The results show a feasible way of overcoming the laser integration problem with silicon-based integrated quantum photonics. Foreseeable, commercial applications on a large scale are significantly promoted.
@article{arxiv.2505.01701,
title = {Fully Integrated Vacuum-based Quantum Random Number Generator},
author = {Xin Hua and Yiming Bian and Ying Zhu and Jiayi Dou and Jie Yang and Shengxiang Zhang and Jie Yan and Min Liu and Daigao Chen and Song Yu and Bingjie Xu and Yichen Zhang and Xi Xiao},
journal= {arXiv preprint arXiv:2505.01701},
year = {2025}
}